Connection to Keyboard

The Linux/IrDA keyboard driver is now in user-space. Please see
chapter Connection to Docking Station above.

Lichen Wang: "The so called IrDA-D standard is designed to transfer
Data. It is not suitable for IR Keyboard. IrDA-D is what Dag ported to
Linux OS and what MS ported to Windows OS.

The so called IrDA-C (Control) is designed for Keyboard, Joy-stick,
etc. I am not aware that there is any product in the market that is
using it yet.

IrDA-D cannot talk to IrDA-C. IrDA-C cannot talk to IrDA-D either.
Both the physical encoding/decoding and the software protocol are very
different.

It is possible to implement both IrDA-D and IrDA-C in the same device.
Sharp says that IrDA-D and IrDA-C can coexist -- as long as both of
them are not used at the same time in the same IR space. This sounds
rather funny to me. According to this definition, anything can
co-exist with anything as long as you do not destroy the universe
permanently in the process ;-)

Seriously, what SHARP says is that they can tailor the IrDA-D so that
there are some unused time between the negotiated maximum turnaround
time and the actual transmission. They then squeeze the IrDA-C frames
in those unused time. The IrDA-D Primary and IrDA-C Master must be
implemented in the same device. The keyboards will work, but mice and
joysticks may be sluggish at times."

For details about using external keyboards with Linux PDAs, see
the PDA chapter below.